What is the simpliest way in collecting btc? The application used? Any site or link so I can try? Thank you 
there is 49 pages of other users answering this exact question.
bitcoin is money so there is no easy way to earn it, you have to work for it. and just remember there is not "application" for that and if somebody told you there is be sure that it is going to steal your information.
I think he is talking about the games by which someone can earn little amount of bitcoins by playing them in your smartphone.
just go to: www.xapo.com and find them in their store. Or you can simply download them from Google App Store of your phone.
And as a newbie you should also try faucets, go to Micro Earnings section on this forum and there you will find a lot of them.